The explosion happened in the 400 block of 9th Street, McKeesport around 8 a.m., according to WTAE.
The building was known as the Common Ground Building and it was under construction at the time of the explosion, KDKA reports.
Specifically, crews were working on a handicap ramp when they hit a gas line, police told WPXI.
One person was injured and taken to an area hospital, according to the outlets citing a McKeesport spokesperson.
Gas and electric have since been turned off to the building, police told WPXI.
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